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A new generation of arc detectors for the LHC and Linac4 high power RF system

A new generation of arc detectors for the LHC and Linac4 high power RF system. D. Valuch, O. Brunner (CERN). framework. The arc detectors are used to detect possible electrical discharges that can occur in high power distribution system

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A new generation of arc detectors for the LHC and Linac4 high power RF system

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  1. A new generation of arc detectors for the LHC and Linac4 high power RF system D. Valuch, O. Brunner (CERN)

  2. framework • The arc detectors are used to detect possible electrical discharges that can occur in high power distribution system • They provide a fault output signal effecting a shutdown of the RF power system prior to damage very expensive equipment such as klystrons, circulators, high power couplers or even cavities • LHC experience shows that some of the optical fibers, usually used in arc detectors, suffer from x-ray induced opacity • The sensors may also exposed to the radiation produced by secondary showers coming from the high intensity beams which, if not treated properly, can cause frequent spurious trips • The arc detector is a crucial equipment for RF systems. However, as the sales volume is rather small (e.g LHC ≈ 120 pc, ≈ 1kCHF/pc), the commercial offer is very limited

  3. a top-performing device • The new LHC AD was designed with a focus on performance and reliability. It introduces redundant detectors for critical environments (e.g. x-ray) and features adjutable detection algorithm based on a voting logic • It is a fast and reliable low light level detection system (<10 µs, < 10 Lux) which can be used in critical environments (high voltage, high power RF, x-rays) • It is an easily adaptable, modular, programmable and remote controlled device 4x Calibration port 2x Blind port 4x Viewport the “showerhead” 8x Attachment screws

  4. status & perspectives • The new LHC AD has been operating in LHC • no false arc trips recorded in 2012 • Final validation proof-of-concept studies of the fibre-less version are still being worked on today • Series production for Linac4 will soon start • Frequent requests/interest from other research institutions or industries who would like to use them (ESRF, Thales, IPN, ESS,…) • How to respond to these requests??

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